Update nix requirement from 0.30 to 0.31 (#421)

Author: loongs-zhang

Cargo.toml

@@ -43,7 +43,7 @@ corosensei = "0.3"
 core_affinity = "0.8"
 crossbeam-utils = "0.8"
 crossbeam-skiplist = "0.1"
-nix = "0.30"
+nix = "0.31"
 io-uring = "0.7"
 windows-sys = "0.61"
 anyhow = "1.0"